I was running around capturing portals like a good little Enlightened, creating links between portals in a small area. I hacked one portal and acquired the portal key. I then ran up the road to another portal, hacked and deployed to it and linked it to the first portal.
When I tried to link a third portal to the first one, it said that I no longer had the key for it.
Does the key get used up if you link to it? I thought once you had a key, it never went away unless you dropped it. Is this correct?